Natural selection on a major armor gene in threespine stickleback.

The issue of the role of the gene in natural selection has been a point of long-term debate and study. These authors have taken a novel tack in approaching this problem, namely by studying the evolutionary mechanisms behind the reduction in the occurrence of a certain allele of a stickleback gene for defensive plating.

Since the last Ice Age, marine stickleback fish have repeatedly colonized lakes. Repeatedly, these freshwater...

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